But as the van draws level with his car the left indicator goes on and a second later swerves in front of the hatchback.

The van just manages to make the slip road in a move so sudden the Fiesta driver appears not to have the time to brake.

The driver who filmed the incident, who asked not to be identified, said: “The van driver clearly had several opportunities to safely pull into the nearside lane well in advance of the exit slip at Newhouse.

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“At the last minute, completely out of the blue, the van swerved right across the car and off at the exit slip.

“It was extremely fortunate that it never caused a serious collision.

To make it worse, this happened on a day when we had an amber alert for snow, a yellow warning for ice and variable message signs displaying ‘Winter weather – travel with caution’ all across the network at this time.”